Movie Prop Electronics Hack Chat

April 18, 2022 by Dan Maloney 7 Comments

Join us on Wednesday, April 20 at noon Pacific for the Movie Prop Electronics Hack Chat with Ben Eadie!

It wasn’t too long after the invention of cinema that the need for special effects became apparent. If you want to tell stories, especially the science fiction type of story, you need to build a plausible universe, including all the gadgets and gizmos within it. And so right from the start, propmakers and set designers have had the challenge of making things look futuristic using the technology of the present day.

All too often, the realities of budgets and time constraints have reduced this crucial world-building to an exercise in blinkenlights. But not always. Ben Eadie is a maker and inventor who works in the world of movie magic, specializing in props and practical effects. While he’s certainly as much in love with blinkenlights as any of us, there’s more than that to making a movie look good. He’ll stop by the Hack Chat to talk about how he incorporates electronics into his practical effect builds, and perhaps even reveal some of the movie magic for us.

Our Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, April 20 at 12:00 PM Pacific time. If time zones have you tied up, we have a handy time zone converter.

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A flat LiIon battery shown attached inside the gun safe, wired to the original control board

Gun Safe Made Safer With Lithium Battery Upgrade

April 18, 2022 by Arya Voronova 37 Comments

A proper gun safe should be difficult to open, but critically, allow instant access by the authorized party.[Dr. Gerg] got a SnapSafe and discovered that, while it was quite easy to use, it would also lock the owner out easily whenever the batteries would run out. Meant to be used with four AAA batteries and no way to recharge them externally, this could leave you royally screwed in the exact kind of situation where you need the gun safe to open. This, of course, meant that the AAA batteries had to go.

Having torn a few laptop batteries apart previously, [Dr. Gerg] had a small collection of Li-ion cells on hand – cylindrical and pouch cells alike. Swapping the AAA battery holder for one of these was no problem voltage-wise, and testing showed it working without a hitch! However, replacing one non-chargeable battery with another one wasn’t a viable way forward, so he also added charging using an Adafruit LiPo charger board. One 3D printed OpenSCAD-designed bracket later, he fit the board inside the safe’s frame – and then pulled out a USB cable for charging, turning the battery into a backup option and essentially creating an UPS for this safe. Nowadays, the safe sits constantly plugged into a wall socket, and [Dr. Gerg] estimates it should last for a few weeks even in case of USB power loss.

When you read about hacking gun safes, it’s usually because of their poor security, with even biometric models occasionally falling victim to prying fingers. There’s talk about moving the locking features into the guns themselves, but we remain skeptical. “Powering an electronically locked box with internal batteries” is a fun problem, and just recently, we’ve seen it solved in a different way in this intricate voice-activated lockbox.

Mercury Thrusters: A Worldwide Disaster Averted Just In Time

April 18, 2022 by Lewin Day 60 Comments

The field of space vehicle design is obsessed with efficiency by necessity. The cost to do anything in space is astronomical, and also heavily tied to launch weight. Thus, any technology or technique that can bring those figures down is prime for exploitation.

In recent years, mercury thrusters promised to be one such technology. The only catch was the potentially-ruinous environmental cost. Today, we’ll look at the benefits of mercury thrusters, and how they came to be outlawed in short order.

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Vintage Computer Festival East Is This Weekend

April 18, 2022 by Tom Nardi 1 Comment

This weekend the InfoAge Science and History Museum in Wall, New Jersey will once again play host to the Vintage Computer Festival East — the annual can’t-miss event for anyone who has even a passing interest in the weird and wonderful machines that paved the way for the supercomputers we now all carry around in our pockets. Ticket holders will have access to a program absolutely jam packed with workshops, talks, and exhibits that center around the dual themes of “Women in Computing” and “Computers for the Masses”, plus a consignment and vendor area that almost guarantees you’ll be going home a little poorer than when you got there. But hey, at least you’ll have some new toys to play with.

For those that can’t make the pilgrimage to the tropical wonderland that is the Jersey Shore in April, all three days of the Festival will be live-streamed to the VCF YouTube page. There’s even an official Discord server where you can chat with other remote attendees. We’re glad to see more events adopting a hybrid approach after two years of COVID-19 lockdown, as it gives the far-flung a chance to participate in something they would otherwise miss completely. That said, there’s no virtual replacement for the experience of browsing the exhibits and consignment areas, so if it’s at all possible we recommend you get yourself to InfoAge for at least one of the days.

Incidentally, don’t worry if you’ve got the sneaking feeling that it hasn’t been anywhere near a year since the last time the VCF descended on Wall Township. The 2021 Festival got pushed to October because of the lingering plague, but rather than permanently change the date going forward, the 2022 Festival has returned to its traditional season. Of course that means the wait until VCF 2023 will seem unusually long after this double-shot, so here’s hoping we see another swap meet at the InfoAge campus before the end of the year.

Gridfinity: 3D Printed Super Quick Tool Storage And Retrieval

April 18, 2022 by Dave Rowntree 32 Comments

Our favourite cyborg [Zack Freedman] has been stumbling over a common problem many of us will be all too familiar with — that of tool storage and the optimal retrieval thereof. His solution is the Gridfinity: A modular workshop organisation system.

Never chase your pen around on the desk again

In [Zack]’s words, the perfect workshop has tools and materials arranged in the following way: (a) every item has a dedicated home within reach of where you’ll use it. (b) items are exposed and in position for instant grabification. (c) the storage system shields you from accidents like spills and injuries. (d) it is effortless to setup and easy to put back and rearrange. An instant-access storage solution such as the Gridfinity is designed not to help you store more stuff, but finish more projects. The idea is very simple — display your stuff so that you can quickly find what you need and get back to the project as quickly as possible. We think these aims are pretty spot on!

From an implementation perspective, the system consists of a 3D printed base plate with a grid structure. It is angled internally so storage bins drop in, but are not easy to knock out. Storage units drop into the grid in various sizes and orientations, such that everything is contained within the grid’s outer boundary, so the whole assembly will fit inside a drawer with ease. Small part storage bins have a curved inner surface enabling one to easily scoop out a part when required. A partial lid on the top allows them to be stacked vertically if required.

Super-quick access to fully sorted stock – no more searching

Whilst the system is work in progress, there are still about a hundred different storage units, for anything from 3D printer nozzles to racks for tweezers. Implemented as parameterised models in Fusion360, it is easy to tweak existing models for your stuff, or create totally new ones, from the supplied templates.

No discussion of tool organisation would be complete without first considering the king of tool organisation [Adam Savage], the principle of first order retrieval is a strong one. For a more in-your-face solution, you could go down the pegboard-on-wheels route, or perhaps if you’re less mobile and in a tight squeeze, then get comfortable with the French cleat and build something full custom right into the walls. Whatever solution you come up with, do share it with us!

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Processing Audio With The RP2040

April 17, 2022 by Bryan Cockfield 9 Comments

The Raspberry Pi, although first intended as an inexpensive single-board computer for use in education, is now ubiquitous in electronics communities. Its low price as well as Linux platform and accessible GPIO make it useful in many places outside the classroom. But, if you want to abandon the ease-of-use in favor of an even lower price, the Raspberry Pi foundation makes that possible as well with the RP2040 chip, commonly found on the Pico. [Jason] shows us one way to make use of this powerful chip by putting one in an audio digital signal processing board.

While development boards are available for this chip, [Jason] has opted instead for a custom PCB which he designed himself and includes an integrated headphone amplifier and 3.5 mm audio jacks. To do the actual DSP work, the RP2040 chip uses three 12-bit ADC channels and 16 controllable PWM channels. The platform is also equipped with the TLV320AIC3254 codec from Texas Instruments. With all of this put together, he has a functioning open-source platform he calls the DS-Pi.

[Jason] has built this as a platform for guitar effects and as a customizable guitar amp modeler, but with a platform that is Arduino-compatible and fairly easy to program it could be put to use for anything involving other types of music or audio processing, like this specialized MIDI-compatible guitar effects platform which is built around the same processor.

An unfastened piece of pipe in a drill press, rotating away

Drill Press Piece Fastening 101

April 17, 2022 by Arya Voronova 16 Comments

What are the options you have for securing your workpiece to the drill press table? [Rex Krueger] shows us that there’s plenty, and you ought to know about them. He goes through the disadvantages of the usual C-clamps, and shows options like the regular drill press vice and a heavy-duty version that even provides a workpiece tilting mechanism, and points out small niceties like the V-grooves on the clamps helping work with round stock. For larger pieces, he recommends an underappreciated option — woodworkers’ wooden handscrew clamps, which pair surprisingly well with a drill press. Then, he talks about the hold-down drill press clamps, a favourite of his, especially when it comes to flat sheets of stock like sheet metal or plastic.

As a bonus for those of us dealing with round stock, he shows a V-block he’s made for drilling into its side, and round stock clamp, made by carefully drilling a pair of wooden hand screw clamps, for when you need to drill into a dowel from its top. The ten-minute video is a must watch for anyone not up to speed on their drill press piece fastening knowledge, and helps you improve your drilling game without having skin in it.

We’ve covered a few ingenious and unconventional drill piece fastening options before, from this wise held down by repurposed bicycle quick-release parts, to an electromagnetic wise that left our readers with mixed opinions.

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